Carrying scraper



Nov. 14, 1939.

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Nov. 14, 1939. J. s. wALcH CARRYING SCRAPER Filed may 2, 193s ssheets-sheet 2 INVNTOR J. S. Wczcla BY @.w? um ATTORNEY Nov. 14, 1939.

J. s. wALcH CARRYING SCRAPER Filed May 2, 1938 5 Sheets-Sheet 3 INVENTORJ. S. Wa ZCI@ BYv ATTORNEY patented New'. lid-9 applicaties may a lass,serial as. acadien ll Elanna.

This invention relates to carrying Scrapers, my principal object beingto provide a scraper of this character in which the dirt retaining bowlis so arranged that the scraper may be loaded to full capacity with aminimum of power, and from which the load may likewise be dischargedwith a minimum of power.

Another object is to provide a scraper so constructed that it may besuccessfully made either in relatively small or large sizes, and whichin any case will have a bowl capable of being made considerably longerthan its width. In this manner, while having a relatively greatcapacity, the scraper may be efciently used where operating widths arelimited by natural or man-made conditions, and which would bar largecapacity Scrapers of ordinary form.

A further object is to provide what I believe to be a novel arrangementfor suspending the bowl and for controlling the movements of the samebetween scraping and dumping positions, and vice versa.

A further object of the invention is to produce a simple andinexpensivedevice and yet one which will be exceedingly effective forthe purpose for which it is designed.

These objects I accomplish by means of such structure and relativearrangements of parts as will fully appear by a perusal of the followingspecification and claims.

ence indicate corresponding parts in the several v1ews:

Figure l is a side elevation of my improved scraper, showing the same ina scraping position.

Figure 2 is a similar View, showing the scraper in a carrying position.

Figure 3 is a top plan view of the scraper.

Figure 4 is a sectional elevation of the bowl of the scraper, showingthe position of the movable shovel plate of the same when adjacent itsformost scraping position.

Figure 5 is a similar view, showing the position of the parts at thefinish of a dumping or load discharging operation.

Figure 6 is a cross-section of the bowl taken on line 6 6 of Fig. 4.

Referring now more particularly to the char' acters of reference on thedrawings, the bowl of the scraper comprises substantially rectangularside plates l connected at theback by a cross plate l extending from topto bottom, and at the front by a cross plate t extending about half waydown from the top. The length of these In the drawings similarcharacters Aof referplates is consequently greater than their height-(lill. :iT-126) or the spacing therebetween. A bottom plate il,

a short distance above the bottom edge of the plate l, extends forwardlyfrom the back; plate l! to a termination in a short downwardly slopingapron 5, which is disposed at a point approxi- 5 mately midway of thelength of the side plates. p

This plate d, and the adjacent portion of the side plates form a fixeddirt retaining portion of the bowl. a

Disposed at a level immediately below the apron 10 t is alongitudinallymovable bottom plate t which terminates in a downwardlysloping scraping blade l. This unit I term the movable shovel or shovelplate. The length of the plates ll and E is substantially the same, andthe apron 5 and 15 plate l are adapted to aline to form a continuoussloping surface as shown in Fig. 5, when the shovel is in its rearmostposition. l

The blade l when fully advanced is adapted to engage under and supportthe lower edge of a `nap or front closing apron This apron extends thefull width between the side plates l and is provided at the top withspaced hinge sleeves 9 hung for free swinging movement on a cross shaftlll. This shaft isl mounted on brackets il at the sides of the plates l,and is disposed immediately in front of the same and on a level adjacentthe lower edge of the plate 3. This shaft is relatively heavy, so that'besidesv forming a hinge pin it also serves to brace the bowl plates. Itwill therefore be seen that when theshovel 6 .is fully advanced andengaged with the apron 8, a dirt retaining enclosure extending for thefull length of the side plates and fro top to bottom thereof, isprovided. 3

The shovel plate t extends under the bottom edge of the plates l, and isturned up on the outside of the same to' form stiiening flanges I2.Relatively heavy plates i3 are secured on and project upwardly from theflanges i2 at their ends and are connected at the top with longitudinaloutwardly facing inverted angle rails I4. These are parallel to plate tand substantially the same length as said plate. The horizontal flangesof these rails ride with a running t in the grooves formed by channeltracks l5, which face inwardly or toward the side plates. These tracksare secured above the rails on the plates I, parallel to the plate ll,and extend the full length of the side plates, being formed along thelower edges and outwardly of the rails with depending skirts i6, whichextend to adjacent the lower edges of the vertical flanges of the railsIll. By

" means of this construction, not only is the shovel slidably supportedfor movement lengthwise of the Iside plates, but the latter areadequately braced against lateral deflection. Also, substantiallydirt-proof enclosed run-ways or tracks for the rails are formed-afeature aided by the fact thatthe channels are closed at their ends.

Disposed inside the bowl and extending the full width between the sideplates substantially from top to bottom thereof is the rear end orpusher plate I1, having side wings I8 extending forwardly and slopingforwardly from the bottom,

.so that they are 'of considerable length at the 'cylinders 2I supportedfrom brackets 22 on the forward plates I3 of the shovel, and whosepiston rods 23 engage the shaft I0 at its ends outwardly of the bracketsIl. When the shovel is in its rearmost position, the piston rodsare`fully extended, and uid to move the shovel'forward is, of course,Vadmitted to the cylinders at their forward end.

Longitudinal movement is imparted to the pusher plate by suitable means,such as a single centrally disposed hydraulic cylinder 24. This issecured on and projects rearwardly from a bracket 25 extending acrossthe bowl at the back, and having a piston rod 26 connected to areinforcing member 21 which extends across the back of the pusher plate.j When the pusher plate is fully retracted, the piston rod is also fullyretracted, and to advance the plate, the uid is admitted to the rear endof the cylinder. The bowlis supported at the back by wheels 28 disposedbehind the bowl and connected by radial arms 29-with a transversesupporting` shaft 30 mounted on the side plates I at their rear end andbelow the cylinder 24. This shaft besides serving as a fulcrum for thearms also braces the bowl. Other arms 3|, rigid with the arms 29, extendupwardly in laterally converging relation to a connection in common withthe piston rod 32 of a hydraulic cylinder 33. 'I'his cylinder extendslengthwise of the bowl above the same and is swivelly supported at itsfront end on a bracket 34. This is held in place by laterally extendingstraps 35 connected to th side plates l at the top and by longitudinaldiverging brace rods 36 extending to the corners of the plates. Advanceof the piston rod from the cylinder therefore turns the arms 29 aboutthe wheels as an axis, and raises thebowl at the back. With theretraction of the piston rod, the reverse move- .draw bar of a tractor.

ment of the parts of course takes'place. The bowl at its front end issupported by a swivel wheel truck 31 adapted for connection to the Thistruck supports a gooseneck member 36, which at its lower rear end ishinged on the shaft I6 between the hingev sleeves of the apron 8.' Thisgooseneck is swung about the front wheel truck as an axis, to 'raise andlowex` the shaft III and the front end of the bowl, by suitable meanssuch as a rearwardly ex'- y 'gooseneck at the top as at 40 and'has apiston* rod l4I which is connected to the frontend of the bracket 34,the cylinders 33 and 39 being substantially alined.

Though these hydraulic devices above described are separate units, it isintended to admit fluid to the cylinders simultaneously, so that thebowl lifts and drops while remaining on a substantially constant level;although when lifting, the front end of the bowl is preferably raisedsomewhat ahead of the rear end. It will be seen, however, that due tothe proposed relationship and common mounting of these hydraulic units,but little strain is placed on the supporting bracket, since thepressures being in the cylinders .at the same time counteract each otheras far as a straining action on the bracket is concerned.

In operation, the bowl is lowered to a scraping position by suitablemanipulation of the supporting units, and the shovel 6 is initiallydisposed in a retracting position or under the plate 4, while the pusherplate is also at its rearmost position. The scraper blade 1 is thenalned with the sloping apron 6, and as the scraper advances, dirt willbe scraped up onto the bottom plate 4. Since the latter is of relativelyshort length, the dirt does not have to push backvery far, and it doesnot require excessive tractor power to load this portion of the bowl.When said pore tion is full, the shovel is advanced, little by'little ifdesired, so as to load the shovel plate now being exposed, and to fillthe corresponding portion of the bowl as a whole. Here again minimumpower is used, since the load already taken into the back of the bowl isnot disturbed when it has once been received. While the scraping actionis proceeding, the apron 6 merely drags on the ground in front of andofcourse on a higher level than vthe scraping blade.

'I'he dirt as scraped up and churning in front of the blade is thereforeall conned and some lof it falls over onto the apron as the bladeapproaches its foremost scraping position as shown in Fig. 4. When afull load has been received, the shovel is advanced still further untilthe blade passes under the supports the apron, thus holding the apronagainst dropping and closing any gap through which dirt might escape.The bowl is their lifted for transport and all the dirt scraped up isretained, since as above stated the apron is held from dropping by theplate and forms a closure with the blade and side plates.

When it is desired to discharge the load, the bowl may be further raisedif necessary and the shovel is retracted. Here again a minimum of powerto eiect the discharge is needed, since none of the load has tovbelifted, as the shovel is merely pulled from under the load and the dirtdrops of its own weight.v At the same time, the apron being releasedfrom the shovel also drops to a depending position, instantly increasingthe width of the discharge gap, and providing for a rapid discharge ofdirt from the adjacent portion of the bowl.

When the shovel has been retracted to its normal rearward position underthe plate 4, only the back portion of the bowl remains to be unloaded,and this Qportion will partly empty of itself, due to the naturaltendency of dirt to lassume an incline, if unrestrained. A comparativelysmall amount of dirt therefore remains to be discharged and this isaccomplished by the forward movement of the pusher plate I1.

' In controlling the operation of the pusher and shovel plates, -Ipreferably, feed -the uid to cylinders 2| and simultaneously so as toexert.

, aivatsa a rearward pull on the her plate coincident` with a forwardpush on the shovel plate, and vice versa., The pusher plate is thuspositively held retracted throughout the advance of the shovel, andwhile the pusher plate tends to advance when the shovel is beingsubsequently retracted, it will not do so until the resistance to thepusher plate is less than that acting on the shovela condition whichwill not be obtained until the shovel is fully retracted. Subsequentretraction of the pusher plate again places the scraper in readiness toreceive another load.

From the foregoing description it will vbe readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful anddesire to secure by Letters Patent is:

l. A scraper comprising abowl which includes spaced side plates, meanssupporting the bowl from the ground, a fixed bottomfplate between theside plates extending forwardly from the back thereof a distance lessthan the length of the side plates, and arranged to initially receivedirt with the advancing movement of the scraper, and a shovel platemovable forwardly from under the bottom plate to receive and retain dirtafter the bottom plate portion of the bowl has been filled.

2. A scraper as in claim l, with meansbetween the shovel plate and sideplates slidably support- A ing the shovel plate for movement lengthwiseof the side plates and parallel to the bottom plate.'

3. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground, a fixed bottom plate between theside plates extending forwardly from the back thereof a distance lessthan the length of the side plates, a forwardly sloping relatively shortapron depending from the forward end of the bottom plate, a shovel platesupported from the side plates for movement lengthwise thereof anddisposed when retracted under the bottom plateon a level immediatelybelow the apron, and a forwardly sloping scraper blade on the forwardend of the shovel plate adapted to substantially aline with the apronwhen said shovel plate is fully retracted under the bottom plate.

4. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground, a fixed bottom plate between theside plates extending forwardly from the back thereof to a terminationsubstantially midway of the length of the side plates, means forming vaclosure between the plates at their front end and including a dependingapron, and a shovel plate on a level below that of the bottom platesupported from the side plates for movement lengthwise thereof froml aretracted position under the bottomplate to a fully advanced position incontact with the apron.

5. A scraper as in claim l, with an upstanding pusher plate mountedbetween the side plates for movement lengthwise of the bottom plate todischarge the load therefrom when the shovel platey is retracted, andmeans applied to the pusher plate for moving the saine.

6. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground, a fixed bottom plate between theside plates extending forwardly from the back thereof a distance lessthan the length of thev side plates, a shovel plate disposed on a levelbelow the bottom plate and of a length such that it may be fullyretracted thereunder, means suppor-ting the shovel plate from the sideplates on the outside lengthwise thereof and in a plane parallel to thebottom plate, and means to move the shovel plate in opposite directionsselectively.

'7. A scraper as in claim 6, in which said shovel plate extends underthe lower edges of the side plates to the outside thereof, and theshovel plate supporting means comprises upstanding members rigid withthe shovel plate at its side edges, rails parallel to the shovel platecarried by the members at the top and including horizontalV flangesfacing away from the adjacent side plates, and channel members securedin fixed connection with the side plates above the rails and providinggrooves facing the adjacent side plates and in which the correspondingrail flanges slidably ride.

8. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground for vertical movement, an apron hungfor free swinging movement between' the side plates adjacent the frontend thereof, the

depth of said apron being such that when thebowl is lowered to ascraping position the apron will drag on the ground with a rearwardslant, and a forwardly movable shovel mounted with the side plates andincluding scraping blade depending to a level below that of the apronwhen the latter is engaged with the ground and adapted to pass under andsupport said apron when the shovel is advanced to its forward limit ofmovement.

9. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground, a fixed bottom plate between theside plates extending forwardly from the back thereof a distance lessthan the length of the side plates, a shovel plate disposed on a levelbelow that of the bottom plate and of a length such that it may beretracted thereunder, upstanding members rigid with the shovel plate atits side edges, rails parallel to the shovel plate carried by saidmembers and including laterally extending fianges facing away from theadjacent side plates, channels mounted in fixed connection with the sideplates above the rails and providing grooves facing said adjacent sideplates in which the corresponding rail anges slidably ride and skirtsdepending from the channels along the lower edges of the grooves.

l0. A scraper comprising a bowl which includes spaced side plates, meanssupporting the bowl from the ground, a xed bottom plate between the sideplates extending forwardly from the back thereof a distance less thanthe length of the side plates, a shovel plate disposed on a level belowthatk of the `bottom plate and of a length such that it may beAretracted thereunder, upstanding members rigid with the shovel plate atits side edges, rails parallel to the shovel plate carried by saidmembers and including laterally extending flanges facing away from theadjacent side plates, and channels mounted in fixed connection with theside plates above the rails and providing grooves facing said adjacentside plates in which the corresponding rail anges slidably ride.

ll. A scraper as in claim 8 in which the apron hanging means comprises atransverse shaft supported from'the bowl, the apron along the tophavingshaft engaging sleeves along the top and spaced apart to exposeportionsof the shaft; there being a wheeled unit supporting the front of thescraper and including a member having elements engaging said exposedportions of the shaft. I

12. A scraper comprising a bowl which includes a bottom plate having ascraping edge, a transverse shaft mounted in connection with the bowlahead of said scraping edge, a front wheel unit to support the front endofthe bowl and including a member having spaced elements turnablyengaging the shaft and leaving portions thereof exposed, and an aprondragging on the ground when the bowl is in digging position and providedwith sleeves surrounding the exposed portions of the shaft.

1-3. A structure as in claim 1, with means to move the shovel platelengthwise of the scraper ,and comprising side members rigid with theshovel plate and upstanding therefrom on the outside of the side plates,and pull means applied to said members.

14. A structure as in vclaim l, with means to move the shovel platelengthwise of the scraper and comprising side members rigid with theshovel plate and upstanding therefrom on the outside of the side plates,and a pair of hydraulic units, each comprising relatively telescoping

